Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:33:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (maps[indmap[x]].size() > mx) ~~~~~~~~~~~~~~~~~~~~~~~^~~~ main.cpp:46:21: warning: unused variable 'val' [-Wunused-variable] int val = i.first; ^~~ main.cpp:47:21: warning: unused variable 'cntval' [-Wunused-variable] int cntval = i.second; ^~~~~~ main.cpp: In function 'int main()': main.cpp:72:26: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &N); ^ main.cpp:76:37: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &u, &v); ^ main.cpp:81:35: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &key[i]); ^ main.cpp: In function 'void dfs(int, int)': main.cpp:40:18: warning: 'pos' may be used uninitialized in this function [-Wmaybe-uninitialized] indmap[node] = pos; ~~~~~~~~~~~~~^~~~~ main.cpp:64:15: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized] ind[node] = ans; ~~~~~~~~~~^~~~~